Organisms called Methanogens are most abundant in a

Options

A. Hot spring
B. Sulphur rock
C. Cattle yard
D. Polluted stream

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: Methanogens are a type of archaebacteria known for their ability to produce methane gas.

2. **Understand the Habitat**: Methanogens thrive in extreme environments. They are often found in anaerobic (oxygen-free) conditions where organic matter is decomposed.

3. **Evaluate the Options**:
- **Hot Spring**: While some extremophiles live in hot springs, methanogens are not typically the most abundant organisms here.
- **Sulfur Rock**: This environment is not ideal for methanogens as they prefer organic-rich environments.
- **Cattle Yard**: This is an environment rich in organic matter and anaerobic conditions, making it suitable for methanogens to thrive and produce methane.
- **Polluted Stream**: Although there may be some methanogens present, this environment is not as optimal as a cattle yard.

4. **Conclusion**: Based on the habitats where methanogens are most abundant, the best option is **Cattle Yard**.

5. **Final Answer**: The organisms called Methanogens are most abundant in **Cattle Yard**.